Narrowing searches based on url, author, date, and other attributes is also possible. For instance, the query [ Streisand sourcename:Techdirt ] restricts searches for "Streisand" to items from the blog "Techdirt".
Examples of other operators follow:

sourceurl:http://www.theverge.com/

items from the blog http://www.theverge.com/

sourcename:"New York"

items from blogs with "New York" in the name

date:10/20/11

items that appeared on 10/20/11

date:[10/1/11 TO 10/20/11]

items appearing between 10/1/11 and 10/20/11

author:"Bill Gates"

items by author "Bill Gates"

title:unsubstantiated

items with "unsubstantiated" in the title

body:"severely polluted"

items with "severely polluted" in the body

link:http://www.marco.org/2011/04/16/rumored-apple-hdtv

items linking to http://www.marco.org/2011/04/16/rumored-apple-hdtv

Note: all operators that take urls will accept simple domain names, which match any item at that domain, or complete item urls.

Results 1 - 10 of 16:

Windows 8.1 now available!
— Less than a year ago we were preparing to launch Windows 8, which introduced our vision of highly personalized mobile computing. And here we are today announcing the global availability of Windows 8.1. Windows 8.1 demonstrates our commitment to continuously improving …

Windows 8.1 Enterprise Preview Now Available
— Today, I'm excited to announce that Windows 8.1 Enterprise Preview is now available for download for customers to start testing the operating system in their environments. Windows 8.1 Enterprise Preview builds on the Window 8.1 Preview …

The Windows 8.1 Preview is here!
— A couple of weeks ago, Antoine Leblond talked about continuing the Windows 8 vision with Windows 8.1. It continues to push ahead with our bet that the PC industry is going through a shift that is driven by mobility. We previously announced that Windows 8.1 …

Continuing the Windows 8 vision with Windows 8.1
— Before we launched Windows 7, we envisioned what the next version of Windows would need to deliver. We made a bet that the PC landscape and industry would undergo a significant transformation driven by an increase in mobility.

Verizon, Sprint to offer new Windows Phone 8 models
— There were two big Windows Phone-related announcements today at the Consumer Electronic Show (CES) in Las Vegas. — First, Samsung said that the ATIV Odyssey will go on sale at Verizon Wireless in the “coming weeks.”